Wireless headphones are a rapidly emerging market, thanks to the continually growing proportion of the population that own Bluetooth-enabled smartphones and tablets. On-ear wireless headphones, in particular, are picking up. We've reviewed several of these style of headphones, and found performance and price to vary wildly. You can spend $30 on a bargain-bin set of wireless headphones, or upwards of $400-500 for some of the name brand audiophile products out there.